Silencer for explosive-engines.



AP. MASSON :DE GRANDSAGNE. SILBNGER FOB BXPLOSIVE ENGINES. APPLICATION FILED DEO.16, IQB.

Patented Jam. 25, 1910.

Figi

j 'In nven 011 PIERRE AJASSON DE GRANDSAQG'NE,v 0F PARIS, FRANCE.

ron. ExrLesrv-n-ENe-Inns.

Specification of Letters Patent.

Patented Jan. 25, 1910.

Application led December 16, 1908. Serial No. 467,771.

of said gas into .the apparatus.

In the yaccompanying drawings two mod es of construction of the silencer are shown 1n car; it 1s open at vertical section in Figures 1 and 2.

According to Fig. 1 the valve which characterizes the invention is constituted bya cylindrical slide composed of two cylinders a and b adapted to slide the one vupon the other. Cylinder a is ixed and, for example, rigidly connected with the frame of a motorone end and closed at the other end and communicates with the exhaust of the engineby means of a pipe c.

This c linder a is lierforated by a great number o openings Cylinder b is also open i at one end and adapted to slide upon or 1n 4 movable cylinder b in the cylinder a which serves to guide cylinder b. C linder b is erforated by openings e w ich corres ond exactly with the o enings d with whic they can coincide. n tween the end-plate of cylinder I) and a suitable fixed bracket g a spiral spring f is located which exerts a continuous pressure upon the irection opposite to the direction of the exhaust gases. Said two cylinders together form a closed relief chamber of lvariable .volume kNormall spring f maintains the movable cylinder in the position shown inthe drawing, that is to say in such position that the openlngs e and d are not superposed. As soon however as the engine is started each exhaust `of the en 'ne will push back the movable cylinder b 1n compressing said spring f until the o enings e-communicate more or less with 't e openings d so that the exhaust gases can escape. 'During the three other strokes of the engine the parts of the silencer will return to their original positions. This muffiin apparatus alllows to divide the pressure of t e gases into two parts, said pressure being assimilated to the pressure existing in the relief chamber a b before the openings d, e communicate. This construction can be modified as'shown in Fig. 2, according to which the valve is composed of twocones, of which one, h, is fixed and connected with the exhaust c, the other, z', being movable and ada ted to slide upon the guide-piece 7c. Sai movable cone z' is under the iniiuence of spring f. The pressure of the exhaust ases acting upon cone z' will push the same ack so that an annular opening is formed between cones i and h through which said gases can escape.

TheI noise which is to be mufiied by the described apparatus being provoked by the sudden iniow of the outer air into the apparatus caused by the vacuum left by the escape of the gases of the exhaust and their partial condensation, it is obvious that this noise will be muiied because the valve automatically prevents the inflow of the air into the a paratus.

.L A silencer for explosion engines coniprlslng in combination with the exha 1st of the en ne, a fixed perforated cy indexmounte "-.upon said exhaust and communieating with the same, a second perforated cylm er movabl mounted upon said fixed ycylinder so that its perforations do not communicate with the perforations of the fixed cylinder when the movable cylinder is in its normal position, a bracket fixed to the frame of the engine, a spiral spring bearing with one end against said bracket and with the other end against the end of the movable cylinder to maintain the same in normal posltion upon the fixed cylinder, substantially as described and shown and for the purposev set forth.

2. A silencer for explosion engines comprising inv combination a fixed cone counected with the exhaust of the engine, a movable cone inserted in the-open front end of the fixed cone, a guide bracket fixed to.

the frame of the engine and guiding the l In witness whereof I have hereunto set outer eld of ghe movalvle coxe abnd It: spiral; my hand in the prence of two witnesses. sprin ocate in sai i e rac et an beariig against the mova le cone for press- ,PIERRE MASSON DE GEMMA-63E' 5 ing the same against the fixed cone, sub- Witnesses':

stantially as described and shown and for Amm FnnY, the purpose set forth. H. C. Con. 

